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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed6764327749e3f796a9f353218fbe96b5d8719281918693e68d8174c57e2d8' 
  AND token = '8tPmQmfGTS0kgfF3VbiPhzs96PLyEq3pB8+rJOz98aY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}